Questions & Answers about Das war wirklich dumm.
Why use dumm here instead of the '-weise' form dummerweise?
In this sentence, dumm is an adjective describing the subject Das (That). The word dummerweise is an adverb that expresses the speaker's attitude about the whole situation, meaning "unfortunately" or "stupidly enough" (for example, Dummerweise habe ich es vergessen - "Unfortunately, I forgot it"). Here, you are just saying the action itself was stupid.
Is wirklich an adjective or an adverb here?
It acts as an adverb modifying the adjective dumm. It tells us how stupid it was ("really" stupid). In German, most adjectives and adverbs share the exact same base form, so wirklich doesn't need a special ending like "-ly" in English.
Why do we use Das instead of Es?
While Es war wirklich dumm (It was really stupid) is grammatically correct, using Das (That) is much more common when pointing back to a specific action, statement, or situation that just happened. It adds a bit of emphasis, just like choosing "That" over "It" in English.
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